Update connected-agents.md

fixed package reference from `azure.ai.projects` to `azure.ai.agents` as suggested in the [Python SDK Docs](https://learn.microsoft.com/en-us/python/api/azure-ai-agents/azure.ai.agents.models.connectedagenttool?view=azure-python)

Author: xtophs

articles/ai-foundry/agents/how-to/connected-agents.md

@@ -230,7 +230,7 @@ To create a multi-agent setup, follow these steps:
     ```python
     import os
     from azure.ai.projects import AIProjectClient
-    from azure.ai.projects.models import ConnectedAgentTool, MessageRole
+    from azure.ai.agents.models import ConnectedAgentTool, MessageRole
     from azure.identity import DefaultAzureCredential